Its name was very accurate, each Reactor was actually four micro-nuclear-Fusion reactors that generated power through a Proton-proton chain reaction. It could, on its own, generate enough power to keep a small garrison operating for a few years. Or a Starfighter for Several weeks at full combat readiness. Most ships had just one, though some featured two, and Larger ships Larger versions capable of lasting for months or years, the City of Aeturna was powered by multiple large scale Reactors.